There is no basis to charge anyone from Congress or the Senate, they don't require security clearances once a "need to know" is established based on their function, so no former oath or signature of an oath was ever sworn for evidence, to "safeguard" our nations defense. Heck, you could put a foreigner in the Oval office with those prerequisites!
There’s no mention of “security clearances” or “oath” in the definition of treason posted above. There can be no question that many in the House and Senate since 2001 have given aid and comfort to the enemy with their words, actions, and inactions on various bills passed and defeated over the years. The matter of “adheres to their enemies” is apparently the threshold they haven’t crossed in as obvious a way.